package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO){
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //  后期需要进行md5加密，然后再进行比对
        String spassword = DigestUtils.md5DigestAsHex(password.getBytes(StandardCharsets.UTF_8));
        if (!spassword.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    public void addEmp(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        //属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);
        //初始状态默认1启用  0表示禁用
        employee.setStatus(StatusConstant.ENABLE);

        //工工资都拿使用自动填充
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
        //默认初始密码为123456 设置为md5加密后的
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //客户端发起的每一次请求都是一个线程 jwt中有登录的用户id
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insertEmp(employee);
    }

    /**
     * 员工分页查询
     * @param employeePageQueryDTO
     * @return
     */
    public PageResult empPage(EmployeePageQueryDTO employeePageQueryDTO) {
//        //要查询的页码
//        int page = employeePageQueryDTO.getPage();
//        //每页显示的记录数
//        int pageSize = employeePageQueryDTO.getPageSize();
//        //从那条记录开始查=（要查询的页码-1）*每页显示的记录数
//        int wherepage = (page - 1) * pageSize;
//
//        //mapper中要用limit ？，？ 分别是 从那条记录开始查 查询的记录数就是pageSize


        //调用pagehealper的startpage方法 mapper曾就不用写limit条件了
        //调用pagehealper返回值类型必须是Page<>

        //开始分页
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        Page<Employee> employeePage = employeeMapper.selectPageByName(employeePageQueryDTO);

        long total = employeePage.getTotal();
        List<Employee> result = employeePage.getResult();


        return new PageResult(total,result);
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    public void enableOrDisableEmp(Integer status, Long id) {
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.update(employee);
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    public void editEmp(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);

        //公共字段自动填充
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.update(employee);
    }



    /**
     * 根据id查询员工信息用于回显
     * @param id
     */
    public Employee queryEmpById(Long id) {
        Employee employee = employeeMapper.selectEmpById(id);
        return employee;
    }

}
